I'd bet it wasn't. I saw this sort of thing shown off as one of the advantages of Android's Intent system (e.g. highlighting a URL or phone number in a note-taking app) at a developer event months before the G1's release.

So far as I understand, iOS doesn't have the same sort of Intent architecture, so it seems unlikely that that Google's implementation drew any inspiration from iOS (especially as the same sort of thing has been done in web browsers for years to the point where a browser might be prior art).